This is the first ever XML editing I've ever done using s4pe (Sims 4 Package Editor). I think it's been successful so far, having tested all of the Teen careers on a Young Adult Sim in Willow Creek. It no longer resets your Sim on the spot.

This was tested on the December 6, 2016 Patch, PC Version 1.25.136.1020.

To install: Extract .package file using 7zip and place it in the C:\Users\___\Documents\Electronic Arts\The Sims 4\Mods folder.

All credit goes to plasticbox - I basically looked over his/her .package files to see what needed to edited.